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NEET • BIOLOGY • LOCOMOTION AND MOVEMENT
Locomotion and movement practice · Medium
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Medium
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Understanding
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Identify the correct statements
I. Acetylcholine is released when the neural signal reaches to the motor end plate
II. Muscle contraction is initiated by signals sent by CNS via a sensory neuron
III. During muscle contraction, isotropic bands get elongated
IV. Repeated activation of the muscles can lead to lactic acid accumulation in them
The option with correct choices is
I. Acetylcholine is released when the neural signal reaches to the motor end plate
II. Muscle contraction is initiated by signals sent by CNS via a sensory neuron
III. During muscle contraction, isotropic bands get elongated
IV. Repeated activation of the muscles can lead to lactic acid accumulation in them
The option with correct choices is
View answer and explanation
Correct option: B
I and IV
Option B (I and IV) is correct because acetylcholine release initiates muscle contraction, and repeated muscle activation can lead to lactic acid accumulation.
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Analyzing
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Which of the following is correct for the given assertion (A) and reason (R)?
Assertion (A): Knee joint is hinge joint type joint.
Reason (R): Femur, patella and fibula are associated with knee joint.
Assertion (A): Knee joint is hinge joint type joint.
Reason (R): Femur, patella and fibula are associated with knee joint.
View answer and explanation
Correct option: C
(A) is true statement but (R) is false
Option C is correct because the knee joint is indeed a hinge joint, but the reason is false as the fibula is not directly associated with the knee joint articulation.
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Understanding
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Assertion: Rapid spasm in muscle is termed as
tetany.
Reason: Tetany is usually caused by an increase
in the blood calcium level.
tetany.
Reason: Tetany is usually caused by an increase
in the blood calcium level.
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C (If Assertion is true but Reason is false) is correct because tetany is caused by a decrease in blood calcium levels, not an increase.
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Remembering
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Hydra can use its tentacles for
View answer and explanation
Correct option: D
Both (a) and (b)
Option D is correct. Hydra uses its tentacles for both capturing prey and locomotion.
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Understanding
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Both proteins, actin and myosin are arranged in a rod-like structure in the muscles
View answer and explanation
Correct option: B
Parallely
Option B (Parallely) is correct because actin and myosin filaments are arranged parallel to each other within the muscle fibers to facilitate muscle contraction.
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Understanding
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Which of the following option shows correct order of some stages of muscle contraction from the beginning to the end of the process?
View answer and explanation
Correct option: B
Stimuli→ Neurotransmitter secretion→Excitation of T-system →Release of →Cross bridges formation → Sliding of actin filaments→ ‘H’ band diminishes
Option B is correct because it accurately represents the sequence of events in muscle contraction, starting from the stimulus to the diminishing of the H band.
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Understanding
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Assertion: A person becomes fatigue very soon
during exercise.
Reason: Muscle fibres undergo oxygen debt
during exercise.
during exercise.
Reason: Muscle fibres undergo oxygen debt
during exercise.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
is not the correct explanation of Assertion
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both fatigue and oxygen debt occur during exercise, oxygen debt is not the only reason for fatigue.
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Analyzing
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Assertion: The phase of muscle contraction occurs when myosin binds and releases actin.
Reason: Muscle contraction is initiated by a signal sent by the peripheral nervous system via motor neuron.
Reason: Muscle contraction is initiated by a signal sent by the peripheral nervous system via motor neuron.
View answer and explanation
Correct option: C
If the Assertion is correct but Reason is incorrect.
Option C is correct because the assertion is correct: muscle contraction occurs when myosin binds and releases actin. However, the reason is incorrect: muscle contraction is initiated by a signal from the *central* nervous system, not the peripheral nervous system.
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Understanding
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Cytoskeletal elements like microfilaments are also involved in
View answer and explanation
Correct option: C
Amoeboid movement
Option C (Amoeboid movement) is correct because microfilaments are essential components of the cytoskeleton involved in the formation of pseudopodia during amoeboid movement.
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Analyzing
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Assertion (A): The myosin rich zone called A-band maintains its length during sarcomere contraction
Reason (R): The length of I-band remains the same during muscle contraction.
Reason (R): The length of I-band remains the same during muscle contraction.
View answer and explanation
Correct option: C
If A is true, but R is false
Option C (If A is true, but R is false) is correct because the A-band's length remains constant during contraction, while the I-band shortens.
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Remembering
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Visceral muscles are also called
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because visceral muscles are also known as smooth muscles, non-striated muscles, and involuntary muscles.
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Understanding
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Select the incorrect match
View answer and explanation
Correct option: C
Joint between carpals- Saddle joint
Option C (Joint between carpals- Saddle joint) is correct because the joint between carpals is a gliding joint, not a saddle joint. Saddle joint is present between carpal and metacarpal of thumb.
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Analyzing
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Assertion: In a resting sarcomere, H-zone is paler (less dark) than the remaining A-band.
Reason: H-zone of resting sarcomere contains only thick filaments whereas the rest of the A-band has only thin filaments.
Reason: H-zone of resting sarcomere contains only thick filaments whereas the rest of the A-band has only thin filaments.
View answer and explanation
Correct option: C
Assertion is true, Reason is false.
Option C (206 bones) is correct because the adult human skeletal system typically consists of 206 bones.
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Understanding
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Choose the correct properties of muscle fibres
I. Muscle fibre is lined by the plasma membrane called sarcolemma
II. Cytoplasm of the muscle fibre is called protoplasm
III. Sarcolemma of the muscle fibre encloses the sarcoplasm
IV. Muscle fibre is syncitium
Select the correct option
I. Muscle fibre is lined by the plasma membrane called sarcolemma
II. Cytoplasm of the muscle fibre is called protoplasm
III. Sarcolemma of the muscle fibre encloses the sarcoplasm
IV. Muscle fibre is syncitium
Select the correct option
View answer and explanation
Correct option: A
All except II
Option A (All except II) is correct because muscle fiber cytoplasm is called sarcoplasm, not protoplasm.
Revision notes and key takeaways
Review LOCOMOTION AND MOVEMENT in your textbook or class notes, then use this set to check your understanding.
Showing 91-104 of 104 questions